I tried inserting some glyphs by range, but when I click the validate button the error message says that all glyphs exist and my input is erased. These glyphs do not exist in the font.
Cdoublestruck-Hdoublestruck
elevencircled-twentycircled
I tried with some that do exist:
a.pcap-z.pcap
The error message, as expected, says that the glyphs already exist, but the text is not erased.